These computers were used for a wide class of tasks in a variety of areas, including Mechanical Engineering and the Economics.

There were a number machine's modifications: "Nairi-M" (1965) - the photoreader FS-1501 and the tape puncher PL-80 were introduced into the periphery.

The amount of RAM, made on ferrite rings, has been increased to 2048 36-bit words, more efficient input-output devices were used, which were included in the Nairi-K package.

Through the advances in computer technology since the initial production year of 1964, it became possible for upwards of 128 thousand micro-instructions to be stored at one time.

Not to mention the reduction in access times due to advances in the manufacture process of the components.

Some of which includes the usage of a long-term form of read-only memory to store the computer's firmware, on a sampling cycle of 8 μs, while on other, similar systems, the firmware as well as external, foreign programs were stored on external storage devices, such as magnetic drums, the predecessor to modern day hard drives.

For the first time, microprogram emulation of a computer of a different type was implemented, with a different command system: on Nairi-3 it was possible to execute programs Minsk-22, Razdan-3.